Nikon D800 User Manual (en)

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Attach the lens.
Keeping the mounting index on the lens aligned with the 
mounting index on the camera body, position the lens in the 
camera’s bayonet mount (q). Being careful not to press the 
lens-release button, rotate the lens counter-clockwise until it 
clicks into place (w).
If the lens is equipped with an A-M or 
M/A-M
 mode switch, select 
A
(autofocus) or M/A (autofocus with 
manual override).
A
Detaching the Lens
Be sure the camera is off when removing or 
exchanging lenses. To remove the lens, press 
and hold the lens release button (q) while 
turning the lens clockwise (w). After removing 
the lens, replace the lens caps and camera body 
cap.
D
CPU Lenses with Aperture Rings
In the case of CPU lenses equipped with an aperture ring (
aperture at the minimum setting (highest f-number).
A
Image Area
The DX format image area is automatically 
selected when a DX lens is attached (
Image area